Effect of particle concentration during kneading on the particle dispersion state of carbon slurry

Abstract

Slurries are used across various industries, with particle dispersion control being crucial for optimizing product properties. The kneading process, involving high particle concentration kneading followed by dilution, is known to enhance particle dispersion in the production of electrodes and paint. However, not all industries that optimize product characteristics through particle dispersion control in slurries adopt the kneading process. This study analyzes the impact of kneading conditions on slurry properties, using carbon slurries as a case study to elucidate its true effects. Our findings revealed that as the particle concentration increased during kneading, particles exhibited behaviors such as “dispersed,” “aggregated,” “dispersed and then aggregated,” and “unchanged.” Traditionally, kneading has been viewed as a method to promote particle dispersion. However, this study highlights the need for a renewed understanding of kneading effects, challenging the conventional perception of its role in affecting particle dispersion.